51222081831565 has 32 divisors (see below), whose sum is σ = 65402869049856. Its totient is φ = 38431171257600.

The previous prime is 51222081831409. The next prime is 51222081831607. The reversal of 51222081831565 is 56513818022215.

It is a happy number.

It is not a de Polignac number, because 51222081831565 - 2²³ = 51222073442957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20211394 + ... + 22604083.

It is an arithmetic number, because the mean of its divisors is an integer number (2043839657808).

Almost surely, 2^{51222081831565} is an apocalyptic number.

It is an amenable number.

51222081831565 is a deficient number, since it is larger than the sum of its proper divisors (14180787218291).

51222081831565 is a wasteful number, since it uses less digits than its factorization.

51222081831565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42815709.

The product of its (nonzero) digits is 1152000, while the sum is 49.

The spelling of 51222081831565 in words is "fifty-one trillion, two hundred twenty-two billion, eighty-one million, eight hundred thirty-one thousand, five hundred sixty-five".